diff --git a/src/lexer.rs b/src/lexer.rs
index 02a4a1c..46ca7a3 100644
--- a/src/lexer.rs
+++ b/src/lexer.rs
@@ -156,7 +156,7 @@ impl<'t> Lexer<'t> {
             (Integer, Some('d')) => return self.consume().digits::<10>(),
             (Integer, Some('o')) => return self.consume().digits::<8>(),
             (Integer, Some('x')) => return self.consume().digits::<16>(),
-            (Integer, Some('z')) => return self.consume().digits::<36>(),
+            (Integer, Some('~')) => return self.consume().digits::<36>(),
             (Integer, _) => return self.digits::<10>(),
             (Amp, Some('&')) => AmpAmp,
             (Amp, Some('=')) => AmpEq,